Which document must employers post in a prominent location as per OSHA requirements?

Employers are required to post the OSHA poster #3165, titled "It's the Law," in a prominent location within the workplace as a means to inform employees of their rights under the Occupational Safety and Health Act. This poster outlines employees' rights to a safe workplace, the responsibilities of employers, and how to report unsafe conditions. Its visibility is crucial because it serves as a constant reminder to employees about their rights and the legal protections available to them.

The other options listed, while they may provide valuable information about workplace safety and health policies, do not have the same legal requirement for posting as the OSHA poster does. The annual safety report and the employee safety handbook might not be required to be posted publicly, and the OSHA Safety Manual, which details practices and procedures for maintaining safety, does not fulfill the same purpose of informing all employees of their rights and protections under OSHA. Therefore, OSHA poster #3165 stands out as the essential document that employers must display prominently to comply with the law.